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Current identification:
Original Description
Extra details from original publication
REMARKS ON THE EVOLUTION OF THE TAXON. Sphaeroidinella ionica sp. nov. evolves from Sphaeroidinellopsis seminulina (Schwager), from which it differs for the presence of one or more supplementary apertures, in the Sphaeroidinellopsis Acme-zone (of Cita, 1973), at the same time as Sphaeroidinella dehiscens evolves from Sphaeroidinellopsis subdehiscens. The Sphaeroidinella datum can therefore be identified not only by means of the first evolutionary appearance of Sphaeroidinella dehiscens (subspecies immatura), but also of S. ionica (subspecies ionica).
STRATIGRAPHIC RANGE. Sphaeroidinella ionica sp. n. ranges from the earliest Pliocene (Sphaeroidinellopsis Acme-zone) to the Pleistocene, as recorded in deep-sea Mediterranean sediments cored during Leg XIII of the Deep Sea Drilling Project. On the basis of the observational data now available, the subspecies ionica appears to be limited to the Pliocene, while the subspecies evoluta is only recorded from the Pleistocene.
Editors' Notes
Cita, M. B. & Ciaranfi, N. (1972). Studi sui Pliocene e sugli strati di passaggio dal Miocene al Pliocene, 2; a new species of Sphaeroidinella from late Neogene deep-sea Mediterranean sediments (DSDP Leg 13). Rivista Italiana di Paleontologia e Stratigrafia. 79: 693-710. gs References:

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Sphaeroidinella ionica compiled by the pforams@mikrotax project team viewed: 11-5-2026
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